Segmented urea and siloxane copolymers and their preparation...

Details Segmented urea and siloxane copolymers and their preparation... Segmented urea and siloxane copolymers and their preparation...

2007-08-28

2007-08-28

Peng, Kuo-Liang (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

C525S479000, C525S474000

Reexamination Certificate

active

11152844

ABSTRACT:
Using novel synthetic techniques, siloxane-urea segmented copolymers are made. The copolymers advantageously contain a polyether interface, with controlled morphologies and properties. High molecular weight, high strength siloxane-urea copolymers with urea hard segment contents ranging from 5 to over 60% by weight may be prepared. Polymer properties that can independently be controlled include modulus (1.0 to 120 MPa), ultimate tensile strength (1.5 to 25 MPa), level of equilibrium water absorption (˜0 to 100% by weight) and refractive index (1.43 to 1.46).

REFERENCES:
patent: 4486577 (1984-12-01), Mueller et al.
patent: 5792554 (1998-08-01), Leir et al.
patent: 6495091 (2002-12-01), Manson et al.

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